Description: Membership in the surreals. (Shortened proof on 2012-Apr-14, SF). (Contributed by Scott Fenton, 11-Jun-2011)
Ref | Expression | ||
---|---|---|---|
Assertion | elno | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elex | |
|
2 | fex | |
|
3 | 2 | ancoms | |
4 | 3 | rexlimiva | |
5 | feq1 | |
|
6 | 5 | rexbidv | |
7 | df-no | |
|
8 | 6 7 | elab2g | |
9 | 1 4 8 | pm5.21nii | |